Associating ground magnetometer observations with current or voltage generators

Publication: Research - peer-reviewJournal article – Annual report year: 2017

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DOI

  • Author: Hartinger, M. D.

    Virginia Polytechnic Institute and State University, United States

  • Author: Xu, Z.

    Virginia Polytechnic Institute and State University, United States

  • Author: Clauer, C. R.

    Virginia Polytechnic Institute and State University, United States

  • Author: Yu, Y.

    Beihang University, China

  • Author: Weimer, D. R.

    Virginia Polytechnic Institute and State University, United States

  • Author: Kim, H.

    New Jersey Institute of Technology, United States

  • Author: Pilipenko, V. A.

    Institute for Space Research, Russian Federation

  • Author: Welling, D. T.

    University of Michigan, United Kingdom

  • Author: Behlke, Rico

    Geomagnetism, National Space Institute, Technical University of Denmark, Diplomvej, 2800, Kgs. Lyngby, Denmark

  • Author: Naemi Willer, Anna

    Geomagnetism, National Space Institute, Technical University of Denmark, Diplomvej, 2800, Kgs. Lyngby, Denmark

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A circuit analogy for magnetosphere-ionosphere current systems has two extremes for driversof ionospheric currents: ionospheric elec tric fields/voltages constant while current/conductivity vary—the“voltage generator”—and current constant while electric field/conductivity vary—the “current generator.”Statistical studies of ground magnetometer observations associated with dayside Transient High LatitudeCurrent Systems (THLCS) driven by similar mechanisms find contradictory results using this paradigm:some studies associate THLCS with voltage generators, others with current generators. We argue that mostof this contradiction arises from two assumptions used to interpret ground magnetometer observations:(1) measurements made at fixed position relative to the THLCS field-aligned current and (2) negligibleauroral precipitation contributions to ionospheric conductivity. We use observations and simulations toillustrate how these two assumptions substantially alter expectations for magnetic perturbations associatedwith either a current or a voltage generator. Our results demonstrate that before interpreting groundmagnetometer observations of THLCS in the context of current/voltage generators, the location of a groundmagnetometer station relative to the THLCS field-aligned current and the location of any auroral zoneconductivity enhancements need to be taken into account.
Original languageEnglish
JournalJournal of Geophysical Research: Space Physics
Volume122
Issue number7
Pages (from-to)7130–7141
ISSN0148-0227
DOIs
StatePublished - 2017
CitationsWeb of Science® Times Cited: 0

    Keywords

  • Ground magnetometer, TCV, Sudden commencement;, Current generator, Voltage generator, Magnetosphere-ionosphere coupling
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